Electron microscopy analysis of grain boundaries and intergranular corrosion in aged Al-Mg-Si alloy doped with 0.05 wt% Cu

Bartawi, Emad  hasan; Mishin, Oleg; Sahaban, Ghada; Nordlien, Jan Halvor; Ambat, Rajan

doi:10.1016/j.corsci.2022.110758

Cited by 22 publications

(8 citation statements)

References 32 publications

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“…Indeed, we demonstrated that LAGBs were almost as susceptible as HAGBs (random and CSL HAGBs) to IGC initiation, and intrinsically less susceptible to corrosion propagation than RHAGBs and CSL HAGBs, 58,60 in agreement with other authors. 32,[61][62][63] However, we showed that cyclic tests led to a strong increase in the susceptibility of LAGBs to IGC initiation and propagation. 58 This was partly explained by the effect of chloride concentration.…”

Section: Discussionmentioning

confidence: 69%

Comparative Study of Techniques and Methods Used to Characterize Intergranular Corrosion in AA2024 Aluminum Alloy

Mondou,

Duployer,

Tenailleau

et al. 2023

J. Electrochem. Soc.

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Three methodologies, i.e., optical microscope (OM) observations, analyses using tomography without synchrotron radiations, and mechanical tests, were used, and their relevancy compared to provide a quantitative description of the intergranular corrosion (IGC) damage. The study was performed on three plates of 2024 aluminum alloy, to take into account variations in the microstructure of the material, using two types of exposure conditions, i.e. continuous immersions and cyclic tests. The resolution of tomography was too low to allow an analysis at the scale of the elementary IGC defects. For thin plates with recrystallized grains, the corrosion damage corresponded mostly to intragranular corrosion, and OM observations were the most relevant technique to quantify correctly this damage. Thicker plates were mainly affected by IGC. Continuous immersion tests led to slightly branched IGC defects and low hydrogen uptake, and OM observations provided an accurate description of the IGC damage that corresponded mainly to a geometrical one. However, combining OM observations and mechanical tests was required for a full description of the IGC damage after cyclic tests that were associated with a strong branching of the IGC defects, i.e. geometrical damage, and significant hydrogen uptake, i.e., a non-negligible volume damage.

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Section: Discussionmentioning

confidence: 69%

Comparative Study of Techniques and Methods Used to Characterize Intergranular Corrosion in AA2024 Aluminum Alloy

Mondou,

Duployer,

Tenailleau

et al. 2023

J. Electrochem. Soc.

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“…[58,59] showed that the susceptibility to intergranular corrosion of 6xxx series aluminum alloys depends on the Cu content and Svenningsen et al [44,57] and Bartawi at al. [58,59] showed that the susceptibility to intergranular corrosion of 6xxx series aluminum alloys depends on the Cu content and the heat treatment parameters. Alloys with a low Cu content (0.0005 wt%) were essentially resistant to intergranular corrosion [57].…”

Section: Localized Corrosion In Al-mg-si-(cu) Alloysmentioning

confidence: 99%

Review on Environmentally Assisted Static and Fatigue Cracking of Al-Mg-Si-(Cu) Alloys

Avramenko,

Michel,

Kollender

et al. 2024

Metals

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This paper reviews the relevant literature and covers the main aspects of the environmentally assisted cracking of Al-Mg-Si-(Cu) alloys. Apart from a brief overview of the major microstructural and mechanical properties, it presents research results on the corrosion sensitivity and stress corrosion susceptibility of Al-Mg-Si alloys. Possible mechanisms of stress corrosion cracking and corrosion fatigue in aluminum alloys, such as anodic dissolution and/or interaction with hydrogen, are considered. A number of factors, including atmospheric or solution conditions, applied stress, and material properties, can affect these mechanisms, leading to environmentally assisted cracking. Specific attention is given to Al-Mg-Si alloys with copper, which may increase the sensitivity to intergranular corrosion. The susceptibility to both intergranular corrosion and stress corrosion cracking of Cu-containing Al-Mg-Si alloys is mostly associated with a very thin layer (segregation) of Cu on the grain boundaries. However, the effect of Cu on the corrosion fatigue and fatigue crack growth rate of Al-Mg-Si alloys has received limited attention in the literature. At the current state of the research, it has not yet been holistically assessed, although a few studies have shown that a certain content of copper can improve the resistance of aluminum alloys to the environment with regard to corrosion fatigue. Furthermore, considerations of the synergistic actions of various factors remain essential for further studying environmentally assisted cracking phenomena in aluminum alloys.

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“…Also, since such impurities are unavoidable, it is important to know how to avoid the negative influence of the impurities and retain properties similar to primary alloys. In this regard, recent studies on the impact of minor Cu additions (≤0.05 wt %) on IGC resistance as a recycling impurity in 6082–Al–Mg–Si alloy have been reported by Bartawi et al , The results indicated that even such a low Cu addition could cause severe IGC in the PA condition, which is related to the presence of grain boundary (GB) particles and a Cu-rich film along some GBs. Therefore, the current work aims to provide a deep understanding of the influence of 0.05 wt % Cu and 0.06 wt % Zn, individually and in combination, on the precipitate crystal structures.…”

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confidence: 99%

“…However, the interest in investigating the influence of Cu and/or Zn as impurities (∼0.02 at. %) on the IGC resistance of recycled Al–Mg–Si alloys has recently received particular attention , due to its importance in recycling. The presence of Cu, which is more noble than Mg and Si, inside the precipitate structure shifts the corrosion potential toward a more positive value, thus influencing the corrosion resistance of the material.…”

mentioning

confidence: 99%

“…However, the presence of Zn, which is less noble than Mg and Si, within the precipitate structure moves the corrosion potential in a negative direction. It is reported that low Cu or Zn contents can influence the corrosion potential of Cu- and Zn-containing particles as well as the corrosion potential differences between the precipitate-free zone, Al matrix, and grain boundaries. ,− …”

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confidence: 99%

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Atomic Structure of Hardening Precipitates in Al–Mg–Si Alloys: Influence of Minor Additions of Cu and Zn

Bartawi,

Marioara,

Shaban

et al. 2023

ACS Nano

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Electron microscopy analysis of grain boundaries and intergranular corrosion in aged Al-Mg-Si alloy doped with 0.05 wt% Cu

Cited by 22 publications

References 32 publications

Comparative Study of Techniques and Methods Used to Characterize Intergranular Corrosion in AA2024 Aluminum Alloy

Comparative Study of Techniques and Methods Used to Characterize Intergranular Corrosion in AA2024 Aluminum Alloy

Review on Environmentally Assisted Static and Fatigue Cracking of Al-Mg-Si-(Cu) Alloys

Atomic Structure of Hardening Precipitates in Al–Mg–Si Alloys: Influence of Minor Additions of Cu and Zn

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